CacheController needs improvement/testing for handling multiple CacheStore objects

[drc-creare]

Description
Currently there is only one CacheController and while it can be instantiated with multiple CacheStore objects (RAM, Disk, S3, etc.) it's current behavior is rudimentary and not necessarily what we would like. Actually, multiple stores are actually untested at present.

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Sample Code

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Additional context
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[jmilloy]

@mpu-creare @drc-creare I think we either need to close this or elaborate what is needed. I can look through tests and see if there are any glaring holes.

it's current behavior is rudimentary and not necessarily what we would like

I'm not sure what the correct/enhanced behavior would be.

[mpu-creare]

@drc-creare do you remember if you had something specific in mind here? Otherwise I agree with @jmilloy, we should close this and make a more specific issue.

There is a lot we can still do with the caching system...